Power reduction in OQAM transmitter architecture using modified IFFT

A variety requirements on the system design are contemplated by the future communication systems. An efficient usage of available spectrum and system resources is expected to provide much more flexibility compared to today's systems. OQAM principle had limitation in handling different QAM symbols separately and also had the drawback in FPGA implementation. Filter bank Multicarrier (FBMC) concept is a extended and modified concept of Orthogonal Frequency division Multiplex principle. A modified architecture of Filter-Bank-Multi-Carrier architecture with offset Quadracture Amplitude Modulation (FBMC/OQAM) is a suitable design in the latest FPGA architectures. Filter bank based multicarrier (FBMC) transmitter architecture with modified IFFT algorithm provides excellent waveform properties with additional degrees of freedom for the system design. The modified IFFT architecture provides the complexity reduced design, when it is compared with normal IFFT design. The modified IFFT design and efficiency of the architecture has been verified by behavioral hardware description language VHDL. The IFFT architecture design is implemented in XC7z020-1 device with clock frequency of 220MHz.